Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
North Frisian
Oom
←
Old Frisian
ām
(inherited)
←
Old Frisian
āme
(mention)
←
Old Frisian
ēm
(mention)